THE ROAD
"THE ROAD" - Teaser Poster

The story centers on a man who embarks on a nightmarish road trip after a nuclear explosion in an attempt to transport his son to safety while fending off cannibals.
Synopsis : A father and his son walk alone through burned America. Nothing moves in the ravaged landscape save the ash on the wind and water. It is cold enough to crack stones, and, when the snow falls it is gray. The sky is dark. Their destination is the warmer south, although they don't know what, if anything, awaits them there. They have nothing: just a pistol to defend themselves against the lawless cannibalistic bands that stalk the road, the clothes they are wearing, a rusting shopping cart of scavenged food--and each other.
French Release : 2009-12-02 | US Release : 2009-12-18
Source : Bloody-disgusting.com
Be careful, every litigious comments will be deleted.
Well, the blogger did mention the son in the next sentence.
The poster is extremely similar to the initial online teaser poster that's been up since last winter at 2929 Productions:
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The book and film "center around a Man AND A BOY". And the "nuclear explosion" is made up - never does the book or the film mention what happened. Go read the book.